Steam generating boiler



2 Sheets-Sheet R. A. SHARP STEAM GENERATING BOILER Filed oct. 5, 1951arch 13, 134.

l VI/EN TOR. i/g/v f7 575550 BY No A TTORNE Y.

March 13, 1934. R. A. SHARP STEAM GENERATING BOILER Filed Oct. 5. 1951 2Sheets-Sheet 2 A TTORNE Y.

Patented Mar. 173, 1934 UNITED STATES PATENT FFICE STEAM GENERATINGBomen Application October 5, 1931, Serial No. 566,970

3 Claims.

This invention relates to certain new and useful improvements in steamgenerating devices or boilers, and refers more particularly to boilersof the portable type.

; .5 Boilers of this character necessarily must be of compactconstruction, and to obtain the desired high efficiency and stillmaintain compact ness, heretofore required a construction involving manygasket joints, which in many instances lo were inaccessible. Thiscondition not only is bad design, but does not pass governmentinspection.

It is therefore an object of this invention to provide a boiler of thecharacter described,

.1``l which if of novel construction to reduce the number of gasketjoints to a minimum and in which these joints may be readily inspected.

Another object of this invention is to provide a boiler of comparativelysmall dimensions, but which is so constructed as to utilize every bit ofheat and thereby insure maximum efficiency.

Another object of this invention resides in provision of a boiler inwhich the entire heating element is removable as a unit.

Another object of this invention is to provide a boiler of the tubulardesign, in which the tubes and their associated headers are rigidlyattached to one of the end plates of the boiler to be removable with theend plate.

With the above and other objects in view which will appear as thedescription proceeds, this invention resides in the novel construction,combination and arrangement of parts substantially as hereinafterdescribed and more particularly defined by the appended claims, it beingunderstood that such changes in the precise embodiment of thehereindisclosed invention may be made as come within the scope of theclaims.

In the accompanying drawings one complete example of the physicalembodiment of this invention is illustrated constructed according to thebest mode so far devised for the practical application of the principlesthereof, and in which:

Figure 1 is a transverse section view taken through a boiler embodyingthis invention;

Figure 2 is a cross section view taken through Figure 1 on the plane ofthe line 22; and

Figure 3 is a cross section view taken through Figure 1 on the line 3 3.

Referring now more particularly to the accompanying drawings in whichlike numerals indicate like parts throughout the several views, thenumeral 5 represents ,a o cylindrical shell having an end plate 6 fixedthereto to permanently close one of its ends. The other open end of theshell is closed by an end plate 7 which is secured to the shell by aseries of bolts 8 connecting iianges 9 riveted to the adjacent end so'portions of the shell and the head 7. The joint between the anges 9 ismade fluid tight by interposing a gasket 10 between their meeting faces.

Secured to the top of the shell 5 is a steam e5 dome 11 which hascommunication with the shell through an opening 12 and which is providedwith an outlet opening 13 with which the steam line, not shown, isconnected to receive the steam generated by the boiler.

A port 14 at the bottom of the shell provides means through which theboiler may be filled with water.

Within the shell is a heating element indicated generally by the numeral15 and compris- 75 ing a plurality of tubes 16 whose ends are secured toheader plates 17 and 18. The tubes 16 are arranged about a comparativelylarge diameter tube 19 disposed above the major axis of the boiler andsecured to the header plates 17 80 and 18 in alignment with a tube 20xed in an opening in the end plate 7.

The tube 20 extends from the end plate '7 to the adjacent header plate17 and its outer end forms an inlet through which a heating unit suchVas an oil burner, not shown, directs a flame into the heating element.The flame and hot gases travel inwardly through the tube 19 into achamber C provided by the space between the header plate 18 and a dishedplate 21, 90 and with which all of the tubes 16 communicate.

The dished plate 21 has its peripheral edge turned inwardly toward theheader plate 18 and has a re-inforcing ring 22 secured thereto by aseries of rivets. Bolts 23 passing through 95 aligned openings in areinforcing ring 24. engaging the inner surface of the plate 18, andthrough the plate 18, are threaded into the reinforcing ring 22 tosecure the dished plate 22 to the header plate 18, a gasket 25 being 100interposed between the plate 18 and the ring 22 to provide a fluid tightjoint.

Disposed within the space C are two baiiie plates 26 and 27 which directthe hot gases, as will be later described. The plate 26 is V shaped 105and is positioned beneath theV tube 19 so that the gases issuingtherefrom are caused to return forwardly through those tubes 16 whichcommunicate with the chamber C above the baiile 26. The hot gases thusdirected, return hrough these upper tubes 16 to a second chamber Cformed by the space between the header plate 17 and a second dishedplate 28.

The dished plate 28 like the plate 21 has its peripheral edge directedinwardly to be secured to the header plate 17 in the same manner as theplate 21 is secured to the header plate 18. This plate 28, however, hasan opening 29 to accommodate the tube 20. The opening 29 is of largerdiameter than the tube 20 and receives a sleeve 3) which has one endsecured to the peripheral edge of the opening 29 and extends inwardlyparallel with the tube 2G to the header plate 17 where it is welded, asat 31, to a lateral flange 32 on the innermost end of the tube 20.

The space between the vtube 2G and the sleeve enables all portions ofthe tube 20 to Contact with the water in the boiler, and a plurality ofstay bolts 33 extending across this space serve to reinforce thestructure at this point.

It is observed that the annular flange 32 abuts the ange of the tube 19which is secured to the header plate 17, and to preclude leakage ofgases from the tubes 19, 20 into the space C', the joint between theflange 32 and the flange of the tube 19 is preferably cemented.

The gases entering the chamber C through the uppermost tubes 16 arere-conducted back into the chamber C through those tubes 16 beneath thebaffle 26 and above a baie 34 disposed in the chamber C. Upon beingreturned to the chamber C the gases are between the two bafe plates 26and 27 and are directed forwardly by the plate 27 to return to thechamber C above a second baille plate 35 therein. From this portion ofthe chamber C the gases are re-con ducted to the chamber C beneath thebaffle plate 27 and then again forwardly to the chamber C beneath thebarile plate 35.

It is thus observed that the hot gases are passed through the tubes sixtimes so that practically every bit of heat is taken therefrom.

From the chamber C beneath the bafiie plate 35 the gases are conductedfrom the boiler through a pair of exhaust ports 36 formed by tubeshaving their ends secured in openings formed in the end plate 7 and thedished plate 28.

It is observed that the entire heating element is rigidly connected withthe end plate 7 through the tube 20 and the exhaust ports 36 and `thatno other connection whatsoever is afforded between the heating unit,which comprises the series of pipes 15 and the tube 19, and the boilershell, except that a support 37 is provided for the extreme inner endor" the heating element. This support, however, has no connection to theheating unit, but merely supports the same. The support 37 preferablycom- "rises a plate fixed to the bottom or the cylindrical shell as at38 and having its forward portion inclined as at 39 to guide the end ofthe heating element into position as it is inserted into the shell.

It is further observed that there are in all, but three gasket joints inthe entire boiler construction: one, between the flanges 9 which serveto hold the end plate 7 to the shell; and one each at the attachment ofthe dished plates 21 and 28 with the header plates 17 and 18respectively. The main joint, which is that between the ilanges 9, isreadily visible at all times and the other two joints may be readilyexposed to view for inspection by merely loosening `the y bolts 8 andwithdrawing the entire heating unit.

The removability of the heating element obviously has many advantages,for not only does it facilitate removal and inspection of all partsthereof, but it permits the ready replacement of defective heatingelements.

Another important feature of this invention is the fact that by dishingthe plates 21 and 28, the chambers C and C are formed by but twoconnected elements necessitating but one gasket joint. The dished shapeof the plates 21 and 28 also entirely eleminates stay bolts and providesa structure of great rigidity.

As will be readily apparent to those skilled in the art to which thisinvention appertains, the boiler may be provided with such otherappliances as blow-off valves, pressure gages and the like which form nopart of this invention and therefore have not been shown; and ifdesired, the boiler may be used as a stationary unit, but isparticularly well adapted to a mobile mounting. This mounting maycomprise a chassis supported -by automobile `wheels and the chassis mayalso carry the rburner fuel and water supply tanks. These .elementshowever, form no part of the invention and are therefore not shown.

The device of this invention also lends itself readily for use as aheating .retort for asphalt and similar bituminous material, and whenused for this purpose, the material to :be `heated is pumped from thetank cars -or other container-s in which it is received and circulatedthrough the shell to .contact with the heating element in place of thewater.

What I claim .as my invention is:

1. A boiler of the character described, comprising a container, aheating element the container comprising a plurality of tubes, headerplates to which the ends of the tubes are secured, dished plate membersconnected .at their peripheral edges with the header plates to, with theheader plates, provide spaced chamber communicated through the tubes,the header plate and dished plate member of one of the chambers havingaligned openings with the` opening in the dished plate member of Vlargerdiameter than that in the header plate, .a cylindrical sleeve contactingthe vperipheral edge portion of .the opening in the dished plate member4and engaging the header :plate to maintain the chamber closed .andprovide `an opening entirely therethrough, a tube :having one endcommunicated with the other chamber and extending through the opening inthe first mentioned chamber Vto the exterior of the container andconnected to said header plates to `.provide means through which aheating medium may be .injected into the chambers and theircommunicating tubes, and an exhaust flue communicating one .of thechambers with the exterior of the container.

2. In a boiler, a closed fluid-tight container having a removable endwall, a heating =unit within the container and removable therefrom withsaid end wall, said heating unit comprising a plurality of tubes, a pairof header plates to which the opposite ends of all of -the tubes .arepermanently secured, dished Walls detachably connected at theirperipheries with the header plates to deine closed chambersat the .ends-of the tubes, said chambers cooperating with the tubes to form a closedsystem for the .circulation of a heating medium, the dished Walladjacent the `removable end wall having an yopening in line withthefadja'centendrof one of the tubes and ibeingof greater vdiameter thansaid tube, a

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cylindrical wall permanently connected at one end to the peripheral edgeportion of said opening and having its opposite end in engagement withthe adjacent header plate, an inlet tube extending through the removableend wall and telescoped within the cylindrical wall in spaced relationthereto, with its inner end directly at the mouth of the adjacent tubeand a permanent Huid-tight connection between said inner end of theinlet tube and the cylindrical wall at the header plate, whereby theinlet tube together with the cylindrical wall and the attached dishedwall are separable from the adjacent header plate as a unit, upon therelease of only the connection between the dished wall and said headerplate.

3. In a boiler, a closed fluid-tight container having a removable endwall, a heating unit within the container and removable therefrom withsaid end wall, said heating unit comprising, a plurality of tubes, apair of header plates to which the opposite ends of all of the tubes arepermanently secured, dished walls detachably connected at theirperipheries with the header plates to define closed chambers at the endsof the tubes, said chambers cooperating with the tubes to form a closedsystem for the circulation of a heating medium, an inlet tube extendingthrough aligned openings in the removable end wall and the adjacentdished Wall with its inner end contacting the adjacent header plate inline with one of said tubes, the opening in the dished Wall being ofgreater diameter than said inlet tube, and an annular wall permanentlyconnecting the inner end of the inlet tube with the dished wall at theperiphery of the opening therein.

RICHARD A. SHARP.

